Fade the market.. try this on the S&P: If the market close is higher than the previous close, sell/short. If the market close is lower than the previous close, buy/cover. If you are already short/long, then ignore the signal and do nothing. You can use the time 10 seconds before the close and place the order before the close, or you can use futures which trade until 16:15. If I remember correctly, this method has worked since 9/11/2001. Someone can check this.. I don't have the data right here.
Anyway, since aug 1, 2002 thru may 30, 2003 it has returned over 220 SP points (not accounting for slippage + commission, but there is less than 1 trade per day average), with a max drawdown of 70 points (around mar 20, 2003). Using futures, a 15k account would be worth 26k. A 10k account would be worth 16k. Do your own due diligence.